Researchers took pictures of men and women ages 20 to 70, manipulated them to increase and decrease contrast between the eyes, lips, and skin, and then asked 100 participants to guess how old the people pictured were. Care to guess what happened? Yup, the higher the facial contrast, the younger the faces appeared. It means that wearing eyeliner, brow pencil, and rosy lip colors (since your lips lose their natural red tint with age) makes you look younger. And fine, you don't need a study to tell you all of that. But it's still nice to have some backup.